I've considered them but the reality is that at this point they're getting harder to find and they seem to be just okay. I don't want to buy refurbished ones of questionable quality or go digging.
5-6 years ago they would have been my first choice, but considering I have fully refreshed brakes already and only drive the car when I'm in the US it doesn't make sense to buy an "upgrade" that I'll barely use and discard in a few years when I want to upgrade properly.
The other reason is the T3 micro big brake kit that'll fit under my wheels is apparently good but not great and only about $200 cheaper than the ZCG kit which is supposed to be substantially better.